"H. Peter Anvin" <[EMAIL PROTECTED]> writes: > Eric W. Biederman wrote: >>>> >>> I saw the 0x40(%esi) stack stuff, and I'm utterly puzzled by it. There >>> is no reason one can't set up %esp to point to a hunk in ordinary memory >>> and use it? >> >> That is what we are doing, remind me to make certain we have this >> field of the boot protocol documented as permanently reserved for >> this. >> >> This comes from the relocatable kernel patches where we run the >> kernel where the bootloader chooses to put it assuming we are >= 1M. >> >> The problem is that we don't have any IP relative data access >> instructions, we don't have a stack, and so the only valid address >> that we know is valid is %esi. Once we compute where we are running >> we can setup a base address register and a stack and everything is >> easy, but the bootstrap to figure out where we are is just a little >> tricky. > > Oh, right. And this runs with interrupts off, so you only need one > dword. That's fine, of course, although the location is a bit awkward.
Yep. That is what I found when surveyed the available locations. Eric - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
